Electric-abc perforating



C. J. HOLSLAG,

ELECHIC ARC PERFOHATINGQCUTTING, 0R REDUCING ELECTRODE.

APPLlcAlou FILED MAR. 3. was

1,321,309. 'I Patented N0v.11,1919.

BAR/wv D/ox/Df,

INVENTOH CLAUDE JHoLsLAG.

A TTRIIEY CLAUDE J'. HOLSLAG, OF SOUTH ORANGE, NEW JERSEY.

ELECTRIC-ARC PERFORATNG, CUTTING, OR REDUGING' ELECTRODE.

Specification of Letters Patent.

'Patented Nov. 11, 1919.

Application led March 3, 1919 Serial No. 280,349.

To all whom t may concern:

Bc it known that I, CLAUDE J. HoLsLAe, a citizen o-f the United States, residing at South (.)range, in the county of Essex and State of New Jersey, have invented 'certain new and useful Improvements in Electricf.

Arc Perforating, Cutting, or Reducing Electrodes, of which the following is a specification.

This' yinvention relates to an electrode to be used in connection with an electric arc for perforating metal plates or cutting or reducing metals of any character and by way of illustiation,biit not limitation, I have shown the electrode used in connection with a source of alternating current, such as a transformer siiuilar to that shown in my copending application, Serial No. 239,447, filed June 11, 1918. In the process of electric are welding and repairin in which metallic electrodes are used, IA ave found that the best welds 'are obtained by applying to the welding-0r repairing electrede a very thin coating which contains a material having a great affinity for oxygen, such as magnesium, boron, ferro-titanium, etc., whereby the oxygen of the air or fiom the metal being welded or repaired is rapidly taken up whereby a homogeneous and strong weldis obtained, all of which is pointed out in my co-pending application, Serial No. In this aforesaid mentioned application, I have pointed out that slag covered electrodes are detrimental to good welding for the reason that the slag gets mixed in with .the molten metal and a porous weld is the result. Heretofore for welding purposes electrodes having many different types of slag coatings have been used and a number of these haverbeen designed with material to give a reducing action, which reducing action for welding is not the proper thing.

Coming now t0 the question of perforatine, cutting or reducing, a strong oxidizing effect isrequired and I, therefore, apply in some Vmanner to the electrode used, a coating which carries a compound that readily liberates oxygen under `the heat of the arc, or I lmay feed air or oxygen in some suitable manner to the end ofthe electrode from which the arc is operating. I have discovered that a steel electrode covered ac vabout three seconds time leaving an aletaisw, sied October 15, i918.'

most circular hole but slightly larger than the electrode itself and entirely clean on one side. It is to be understood that this same type of an electrode is suitable for cutting aswell as perforating From what has beensaid it will be understood that the general objectof this invention isto provide an electrode for perfor-ating, cutting or reducing which will do this work faster and better than elect-rules heretofore used for the purposes mentioned.

In the drawing, Figure l is a view of oneform of my electrode used for perforating a metal plate.v

Fig. 2 is a plan view of a section of the plate show-n in Fig. 1.

Fig. 3 is anenlarged secti-oiial.\'iew on the line 3 3 of Fig. l.

A Fig. 4 is an enlarged view-,of anv electrode having only a partial coating.

Fig. 5 is a. view of the modified forni ofv an electrode adapted for certain purposes.

Fig. (i is still another lform of electrode,

while.

Fig.

shown Fig.

7 is an end 4view of", the electrode in Fig. G. 8 shows an'electrode connected to a.

special transformer T for the purpose of cutting.

As illustrated in Fig. l, an electrode 2 having a covering 3 is shown as entering the plate l,.the arc being formed at the point 4.' As the metal both from the platcl l and electrode 2 is melted under the heat of the arc and the reducing action of libcrated oxygen forming gaseous vapors which are driven out around the electrode as indi@ cated at 5, a little of the molten metal con- (lensing, is deposited atthe edge of thc hole as at (S. about thc same as that illustrated at 7, a small amount of metal being thrown up usually on onc side of the hole as at (i, while the hole at the back sidc of the plate 8 is relatively smooth. The covering 3 may b e -of `any fibrous material, such -as asbestos which is impregnated with some oxygen liberating compound such as bicliroinate of potassium, manganese-di-oxid, ba-riiinidioxid, potassium permanganate, potassium chloratc, etc. I preferably use with these oxy- .gen libera-ting'compounds some of the ingredients used on my welding electrode, such as silicate of soda and carbonate of calcium, as the silicate of soda helps to bind the tibi-ous material together and to thc IVhen the hole is finished it looks lfilled'with an oxygen liberating compound,

or oxygen from any source may be fed throu h the hole'lO to the arc.

In ig. 6, I have shown. an electrode 11 having a groove 12 within which the oxygen liberating compound is placed; however, for

'many classes of work I prefer to use a steel electrode of suitable composition and cover this as shownin Figs. 1 and 3.

When either of the electrodes above described is used for cutting purposes, as shown in Fig.8, the cut is started at the edge of the metal and as this is melted that which doesnot go olf 4in gas drops downthrough the bottomA of the slot and is of course not depositedon the work the same as in the boring operatiom y .The oxygen carried by theelectrode in any of the forms above described or in any other suitable manner, is quickly liberated under the heat of the'arc and combines with the metal liquefying the same and carrying a considerable portion olf as a gas whereby perforating orl oring with the electrode' itself` is lproduced in a highly satisfactory' manner. As pointed out, theprinciples involved in boringor cutting are quite the reverse of welding and are therefore not t0 be confused with those of welding as I have found them.

While I have shown certain forms of electrodes for carrying my invention into practice, I do notwish to be .limited to the exact details shown and described, as a number of changes `will 'suggest themselves to one .skilled in the art.

Having thus described my invention, what I claim is :l

1; A n electrode for use in electricarc perforating, cutting `or reducing, comprising a material arranged to carry a compound adapted under the heat of the arc to give up freely oxygen to the metal that is to be perforated, cut or reduced for the purpose de? scribed.

2. An electrode for use in electric arc perforating, cutting or reducing, comprising a metal rod having a covering of fibrous material carrying a compound adapted under the heat of the arc to give -up freely oxygen to the metals, between which the arc is established for the purpose described.

3. An electrode for use in electric arc pertaining silicate of soda and a compoundl which gives up freely underthe heat of the arc a considerable quantity of oxygen to the metal that is to be perforated, or cut.

5. An electrode for use in electric arc perforating, cutting or reducing, comprising a metal rod having a covering of fibrous material impregnated'with a solution contaming silicate of soda, carbonate of calcium and a compound which gives up freely under the heat ofthe arc a considerable quantity of oxygen to the metal that is to be perforated or cut. A p

6. An electrode for use in electric arc cutting and reducing, comprising a metal rod havinga partial coating of fibrous material impregnated with a solution containing preferably silicate of soda and a compound adapted, under the heatof the are to liberate an excess of foxygenffor the purpose de'- soribed. .f l In witness whereof I aliix my signature. CLAUDE J, HOLSLAG. 

